Thermophilic Solid-State Anaerobic Digestion of Corn Straw, Cattle Manure, and Vegetable Waste: Effect of Temperature, Total Solid Content, and C/N Ratio
Table 2
Three-level-three-factor Box–Behnken design for SS-AD of corn straw, cattle manure, and vegetable waste.
Run
Mixed substrate
Inoculum#
Distilled water
Urea
A : T
B : ISC
C : C/N
(g)
(g)
(mL)
(g)
1
40
17.5
23.5
100
137.02
86
0.345
2
60
17.5
23.5
100
137.02
86
0.345
3
40
32.5
23.5
100
137.02
0
0.345
4
60
32.5
23.5
100
137.02
0
0.345
5
40
25
15
100
137.02
30
1.091
6
60
25
15
100
137.02
30
1.091
7
40
25
32
100
137.02
30
0.000
8
60
25
32
100
137.02
30
0.000
9
50
17.5
15
100
137.02
86
1.091
10
50
32.5
15
100
137.02
0
1.091
11
50
17.5
32
100
137.02
86
0
12
50
32.5
32
100
137.02
0
0
13
50
25
23.5
100
137.02
30
0.345
14
50
25
23.5
100
137.02
30
0.345
15
50
25
23.5
100
137.02
30
0.345
16
50
25
23.5
100
137.02
30
0.345
17
50
25
23.5
100
137.02
30
0.345
With a moisture content of 67.5%, the mass ratio of (dry wt.). #The feedstock-to-inoculum ratio (F/I, based on VS) was 3.
